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'fren VWM. H. GUKLD, UF WILLIAMSBURG. NEW YURK.

.To ai whom it may concern:

Be it known that i, WILLMM H. GUILD, of

i/Viiiiamsburg, lin the county oi' Kings and- State of New York, have invented certain new and usei'ni improvements in "Vacuum-Pumps; and Yi do liereioyrieclare that the-following is a fell, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part oi'tliis specification, in Wliicii- Figure l is a plan of two double-:lotion Va@ anni-pumps eonstrneted according to my in ven-tion ana a double steam engine by means oi which they are operated. Fig. 2 is a longitninai verticai'seotion, on a larger scale than Iii-gl, of one of-tiie pump-cylinders. Fig. 3 a vertical transverse seciiomen tiie saine, eeaie ae one 'atene pnnrpejiinders ;v

l, (section i .tnencinneylinfier and 'retiree-clientc Similar iet-ters indicate corresponding paris of tire maoiiineyin--aii'tiie figures. i

@The onjectoi' this Wention is to .provide for the eneetive prevention of leakage ofV the valves et' a vacuum-pump by keeping'ftheni envered with water or wet Whilecloscd, and especially to obtain this result with respect to erinction `valves arranged in the cylinder-heads;

and to this end the invention consists, in nari, incertain novel arrangements of the induction and eduction .passages and the chambers ooniaining'riie induction Yand ednction valves and, further, in the attachment to the inductionvalve chamber or chambers of the pump, ioetween the ainindnciion vaine or valves and cylinder, of a pipe er pipes distinct from the air-indiiction pipe, for the admission-into the' tion-Valve chest, C, on one sideaf'iilaiedvailveeiiest E is divided longitudinaiiyiiy parte y ion, a, anzi between this partition and thevcyiiniler is .siiiniivicled transversely, by means of a central partition, a', Fig. 5, into two Valvevalves e e. From each of tiiese chambers b b a port or ports in the partitionl a communicate Witli the outer or main induction-channiier, d; and ille induction waives, which lare "com nosed oi' or faced with inilia-ruliberorotller elastic or iiexibie material, are tted or applied to these portsin such manner as to openinward, or toward the cylinder. rIhe said charnbers b b have also communication with the cylinder, near the ends thereof, by ports l l, (see Fig. 5,) whichV are always open. The air-induction pipe is connected at @with the main induetion-ciiamlier d.

To each of the valve-chambers b there -is i-eenneeteaeene end offa annali Waier-pipe, i",ilne otieer end oi' whiclirlips into tile Water in a coni-enieniiy-arranged water-tank, fromwhich the Water is supplied to toepnnip for sealing the air-valves. Each pipef is furnished with h, the valve g serving to regulate the quantityof water tov be admitted; anoitlie checkialve allowing the Water to pass through the escape of air and the return of the Water through the said pipe.

The cylinder Bis covered at each enti, inside of time cylinder-head D, .with a valve-'plata in, containing the portsa a of the eduction-valve o, which is situated in a chamber, i, formed between the said plate and the eyiimle'r-head i by making theinner sinieoi the cylindenhead concave. filie `valves @are oi circular form and arranged `in the center-oi' the `cyiilnieri head, ami the ports `in-eacii :plate in arear- @are represented as made of riexibie vulcaniaeri india-rubber, and secured at 'or around 'tile center, ont opening ali around; the edges.

with an annular passageway, S, surrounding the erinction-valize' ehamloer if', and cornrnnini-- eating 4therewith at the top by means'oifan opening, i. The said; inassageway S nas an 'endet-opening', u, (see Figs. 2 and 4,) at the -bottorn of the cylinder-head D, where an enlaction-pipe is to bve-attached. lihis pipe'may lead" into the Water-taniniroin which the pipes chambers', 2), which contain the air-induction i a regulaiingcoek or valve, g, and a check-valve,

pipe f into the chamber b, but preventing the ran ged in aconeentric circle, The sairi A"inalveni' Eacncyiinder-nead D isCprovideoiinside- 2 einem;

f take their water, so that the Water carried oi from the pump with the air may .be returned to the tank.

E is the piston, fitted into the cylinder B and lpacked in any suitable manner. The pistonrod fv, to which the piston E is attached, passes at one end of the cylinder B through the valveplate m and the cylinder-head D, (see Figs. 2 and 5.) which t'orthis purposeA is provided with a stuffing-box, w. When the piston-rod o' passes through the valve-plate m, that opening should likewise be provided with proper packing.

The eductionvalve o et that end of thecylin-V der may be so. titted to the cylinder as toc'onvstitnte a proper packing.

As the steam-engine represented forms no part of this invention, I shall omit a more par- -tcular description of it.

...The vacuum-pumps may be attached to any kind of well-working engines.

When the pump is in operation the air, entering at v into the main induction-chamber d', presses open the induction-valve e in the chamber b, communicating with that end of the cylinder from which the piston is'moving, and passes through the said chamber 'and its port or ports Z into the cylinder, while the air in front ofthe piston opens the eductienvalve o at. that end of the cylinderv toward 'Which'.the Qis'ton is movin g, and passes through the ports an, eduction-chamber ir, opening t, passage s,jopenng u, and eduction-pipmthe. other induction and ednetion valve being-iii the meantime closed. Dnringthetirst few strokes of the piston after starti ng.,the valves' or cocks g in the water-pipes f are kept wide open to admit water enough toili the induction! valve chamber h' and ednction-valve chamber Y, communicatie g with each end ot' the cylinder toward which the piston is movingas thepiston completes its stroke, and when such quantit-yfof water has been admitted the valves or cocks g are partly closed7 to reduce the supply (if-water to what is necessary to make up for what unavoidabiy passes ed' with the lair at each stroke. of the piston. As the piston moves away from either end of the cylinder the small quantity of Water which remained in the cylinder between the piston -:and-v eduction-valve plate m. at theend of the cylinder, and which tilted the corresponding induction-valve chamber'hiollows the `piston along the bottom of the cylinder, accompanied bythe small quantity of freshwater which entersthrough the pipe f, port or ports e, and induction-valve e belonging to that end of the cylinder; and as the piston moves toward either end of the cylinder the water in front ot' it is pushed beforeit along the lower part of the cylinder, with linder-head, and being forced out4 through the ports land n, lls the induction-chamber-,b

and eduction-chamber o" belonging-to that end of the cylinder toward which the piston lis moving. As the piston returns theeductionvalve, closing behind it, shuts in the water in the eduction-chamber r behind it, and so keeps the valveoof said chambers covered with-water and perfectly sealed, the water being prevented from escaping from the seid chamber to the eduction-pipe lby reason of the outlet t being in lthe upper part of the said chamber and above-the valve o. As the piston com- -mences its movement toward e'ther end of the.

cylinder Dthe opening of the duction-valve() atthat end allows the water@` to run back by gravitation through the portsninto the'cylnder,and so prevents its interference with the egress of air.

I What I claim as my invention, and desireV 'to lsecure by Letters Patengis-- l:lnlhearrangementotv theA main air-inducftioln chamber d, induction-valve chamber b, induction-valves@ and ports c and l, substantially asjgbereindescribed, whereby provision 'is madcjorcoverin g the said valves with 'water as the piston approaches or arrives at their respectweeild ot' the cylinder.

2. Theerrangement of the air-ednctio'n chambers 1", passages s, and openings t and ln n relation tothe eduction-.valves 'in the cylinderheads, substantially' as `and for the purposev herein specified.

3. The water-pipes fand check-valves h h,

applied in combination with the eduction-valve chambers of a. vacuum-pump to induct water from a suitable reservoir at each stroke of the pump-piston', substantially as herein specied.

WM. H. GUILD.

er la.; 

